煤矿主排水泵采用变频前置泵提高运行效率试验研究

煤矿井下排水受限于井下排水条件主排水泵易发生汽蚀,严重影响排水泵使用寿命.为满足井下节能减排要求,提高主排水泵的抗汽蚀能力,提出一种采用串联前置泵对主排水泵进行压入式补水控制方式,前置泵可采用变频器进行变频控制.通过理论分析,可采用泵控泵技术对前置泵变频调速来改变排水系统输出压力,适应管路系统性能,提高排水系统运行效率,保证排水系统工作在高效区内.通过现场试验对比分析,前置泵与减级后主排水泵组成的泵组与未减级的主排水泵相比,泵组效率得到了提高,同时也避免了主排水泵发生汽蚀.前置泵的变频控制也可保证主排水系统压力可调,实现排水系统工作在高效区内,达到节能减排的效果.研究结果可为煤矿主排水系统的设计及改造提供一种新的方案.

Study on operational efficiency improvement of main drainage pump in coal mines with variable frequency booster pump

At present, the main drainage pump in coal mines is prone to occurrence of cavitation due to limited underground drainage conditions, which can shorten the service life span of the pump significantly. In order to meet the requirements of energy conservation and emission reduction in the underground condition, and improve the inflow condition of the main drainage pump, a pressurized water supply mode was proposed by connecting a booster pump with the main drainage pump in series, and the operation of the booster pump can be controlled fully with a frequency converter. Through a theore-tical analysis, the pump-control-pump technique can change the output pressure of the drainage system, adapt to the performance of a pipeline system, improve the operational efficiency of the system, and ensure that the drainage system works in an efficient region. Based on a comparative analysis of field test, the efficiency of the pump unit composed of the booster pump and the main drainage pump with a less number of stages is improved compared with the main drainage pump with original number of stages, but also the cavitation of the main drainage pump is avoided at the same time. The frequency conversion control of the booster pump can also ensure that the pressure of the main drainage system can be adjustable, so that thesystem can operate in an efficient region to achieve the objective of energy conservation and emission reduction. The results provide a new technical scenario for design and transformation of the drainage system in coal mines.